Palm technologies supplies the yeasu dsp sine-wave inverter comes in capacities ranging from 700 v a to 10 k v a. The inverter works on 120v to 280v and also offers an efficiency rate of more than 90 per cent. The inverter is based on dsp sine wave technology, which ensures that the users get efficient sine-wave output. Which gives an altogether noiseless and trouble-free operation in result, just like your mains supply, at a constant voltage.